Valkyrie's Call, Amoeboid Changeling, Intruder Alarm, and Yahenni, Undying Partisan

Prerequisites

• Valkyrie's Call on the battlefield
• Amoeboid Changeling on the battlefield
• Intruder Alarm on the battlefield
• Yahenni, Undying Partisan on the battlefield
• undefined

Steps

1. Activate Amoeboid Changeling's second ability by tapping it, causing another nontoken creature you control to lose all creature types until end of turn
2. Activate Yahenni by sacrificing the creature targeted in step 1
3. When the creature dies, Valkyrie's Call triggers, returning the creature from your graveyard to the battlefield as a white Angel
4. When the creature enters the battlefield, Intruder Alarm triggers, untapping all creatures
5. Resolve the Yahenni ability
6. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite mana creatures you control can produce
• Infinite untap of creatures